package com.example.takeaway.filter;


import cn.hutool.core.text.AntPathMatcher;
import com.alibaba.fastjson.JSON;
import com.example.takeaway.common.BaseContext;
import com.example.takeaway.common.R;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器 支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        log.info("过滤器启动:--> 拦截路径 {}", request.getRequestURI());

        //1.获取本次请求的url
        String requestURI = request.getRequestURI();

        //
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg", //移动端发送短信
                "/user/login"   //移动端登录

        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);


        //2.1如果不需要处理 直接放行
        if(check){
            log.info("本次请求不需要处理-->{}",requestURI);
            filterChain.doFilter(request,response);
            return;
        }


        log.info("用户一登陆---》{}",request.getSession().getAttribute("employee"));
        //2.2 判断登录状态 如果已经登录 放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户一登陆---》{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            long id = Thread.currentThread().getId();
            log.info("线程id为 ---》 {}",id);

            filterChain.doFilter(request,response);
            return;
        }


        //移动端判断登录状态 如果以=已登录 直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("手机号登录  -》用户已经登录,用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long)request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;

        }



        log.info("用户未登录");
        //3.如果没有登录 则返回未登录结果 通过输出流的方式向客户端界面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;








    }

    /**
     * 路径匹配 检查当前请求是否需要放行
     * @param requestURI
     * @return
     */

    public boolean check(String[]  urls , String requestURI){

        //快捷键 urls.for 回车
        for(String url : urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }

        return false;




    }



}
